Number 7 cylinder lifters stops moving when truck starts. Took it to my dads and he tore things apart and found that I had a lifter that was stuck. Delete the AFM, buy a tuner/chip, take it to a performance place and get an actual tune done that fixes it, replace the AFM lifters with non AFM type, change other engine components with thisetc..etc..etc??? I just did the delete and replaced the cam as well. Replaced all lifters. I phoned the dealer and gave the VIN number, told it isnt equipped with AFM. In October of 2010, GM added a deflector (p/n NAL-12639759) to keep oil from being sprayed directly on the rear cylinders. . I switched from gm to dodge in 1984, have had 3 1st gen Durango and 4 2nd gen Dakotas, all used, with impeccable reliability. If I put my truck in manual 5, it doesnt try to go into V4 mode. If you want to delete it entirely, its a M14 x 1.5 pipe plug or you could use the Improved Racing plug p/n IRP-814-M14-Kit. Hopefully more is known by then. You can unplug the sensor on the vacuum booster and it will fool the computer into thinking there is a high demand on the engine and shut down the AFM system but you will have a Check engine light in your face for doing so . It essentially turns your V8 engine into a V4 which saves fuel. Just one. Been driving with no issues but I did notice that the AFM disabler removed a P0449 code (Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction) dont know if this is a coincidence or they are related??? NOTE: You can find engine specs and detailed engine upgrade advice for every LS and LS-based Vortec truck engine in one place: The Definitive Guide to LS Engine Specs and LS Engine Upgrades. I cant stand seeing customers continuously going thousands of miles over on the oil and wonder why theres problems. Verified over hundreds of trips, makes no sense. There are so many more oil passages on engines these days. Installed them again, all facing upwards, will know tomorrow if that was the solution.If this is the cause i cant beleve why they arnt build so that it is impossible to install them the wrong way in the plastic holder.And altso that there was no warning or installation advice With the New lifters.If these are the only lifters in the Whole world that must be in The most common issue GM vehicle owners with AFM report is increased fuel consumption. The exhaust valve remains open during the intake stroke and closes just before BDC. Fouls those plugs. The trucks are only supposed to use two four. Vortec 5300s featuring LH6 and LC9 engines are prone to failing spark plugs due to carbon build-up. I have also heard that the oil pump is to be changed and I have also heard that it does not matter. Oil flows to the special lifters through theAFMtowers. Some drivers want V8 power under their foot at all times. , Production date on the vehicle is 04/2006 oddly enough. Plug the tuner into your GM vehicle's OBDII diagnostic port, and follow the instructions provided to update the engine control module's program The new program will make sure that AFM never engages. Very confusing stuff out there. Everything was fine for two weeks, ow customer complains s it same noise it made as before. So I did the job one more time. Who knew? I have a 12 wit 4.8 Silverado 75000 miles But I can replace all of the other engine parts without doing the pistons and bearings so that is what I plan to do. What was happening to the first is slowly (or quickly in your case) happening to the others. It is a bad deal for sure.ive fixed a few best thing u can do is delete it in buy kit.no sense in fixing a flawed problem with the same flawed parts. Keith, sometimes they will only replace one lifter rather than the whole setIf thats the case, another lifter can fail again pretty quickly. I speak from some experience. I pulled the head off, replaced the lifter and put the gadget in the ODBII for about $400 total. No other truck my ass .lol my 99 silverado 1500 with the junk LR4 4.8l and 320k miles 9n itgets 21mpg all day long with 93 octane gas in it. put tran fluid in oil for a day till lifter became active, had to change the fouled plug. Brian, thank you for the quick response. There is a filter screen under the oil pressure sender that may be clogged and not getting enough oil to supply the solenoids. Hi Mike, the metal shield you noticed is probably the windage tray. Better airflow reduces drag on the pistons and the associated pumping losses. Truck ran fine before that. My question on a 2007 Chevy Tahoe 5.3 AFM But the problem at that time was the computer technology. The pressure relief in the pan opens at around 45psi to prevent over pressurization of the vlom solenoids. Had similar problems under warranty, no telling what they rigged me up with at the dealer. The engine has flex-fuel capability. I have only put about 600 miles on it and noticed that the oil was a bit low and am hoping that it was that way when I picked it up. Why cant u just unplug the solenoid on back of engine by oil pressure sensor? The Tundra fares better but the frame has the rigidity of wet spaghetti and the 5.7 has had problems with VVT solenoids and the plastic timing chain tensioners. I have a shop 39 yrs . The biggest difference between the Vortec engines that used to be found in Chevy and GMC vehicles and the EcoTec engines found in them now are the fueling methods. Junk . I would. The Cylinder Deactivation system, known as the Active Fuel Management system by GM, shuts off some of the cylinders when extra power is not needed which improves fuel economy. Regards, Toyota will be my next truck unless GM owns up and makes wright with consumers. My 2013 LC9 just had #6 lifter fail, got a misfire code but the ticking gave it away. []. Have there been improvements in more recent model years employing AFM [2014 or newer]? Oil consumption problems can be caused by a number of factors, including low oil pressure, worn oil seals, or worn engine parts. stalled in a certain way a warning wouldn be a bad idea. Don't even get me started on the shortened life of the cooling, starting and charging systems. The vehicles affected were 2007 to Feb. 2011 AFM equipped engines (Aluminum or Iron block-L94, LZ1, L99, LC9, LH6, L76, LFA, LMG, and LY5). Now I learn about the cylinder deactivation issue and suggestions to add the Range Technology module to deactivate it. Keeping the oil changes regular is important and its possible that a previous owner may not have been as diligent as you are. Dale, I have a 08 Tahoe thats doing the same thing.Any info you have on this would be appreciated, [] Do they have a downside? What makes you think it was a design flaw ? This system was originally used in early 1980s Cadillacs. Jusy 3 weeks ago I quit driving it because of the lifter, but it worked fine when i started it back up. The biggest problem is nobody changes their oil on time. Yes thats true. . She had driven it for a couple of months that way. I wouldnt trade my 2000 Silverado, 5.3 liter that has constantly gotten 20 mpg since I bought it 15 years ago, for a dozen of these new $50,000 POS. When a deactivated cylinder is reactivated, the control system opens the exhaust valve first to evacuate the trapped exhaust gas, before reactivating the intake valve to allow reactivated cylinders to revert to the normal operation of the compression/combustion exhaust/intake cycle. Install ls3 valley cover. Send response to tkrieg@cox.net. Fortunately, the old engine hadnt been shipped back to the remanufacturer. Per bulletin 10-06-01-0007b, 2007 L92 had first and 2nd design. I had the same issue and had to have the AFM information deleted from the computer and the car tuned. Then changed the oil. Having it fixed now, just curious Seems like a problematic design. https://www.amazon.com/gp/product/B00BR1R8N8/ref=ox_sc_act_title_1?smid=A359W9MWR50ZG1&psc=1. Seems like the AFM disabler device is working for a number of people including myself as the 5.3l AFM engine has inherent design faults. Your email address will not be published. It seems this tough engine has everything incorporated into it. The wife however found this deal on an Envoy Denali . I guess what Im really trying to ask is,, are there any cons/disadvantages to installing the AFM delete Electronic module? My question is: do I install the electronic disabler on the new engine to avoid future issues? If you installed a factory truck cam, there shouldnt be any particular reason for it to be down on power. Thats a tough call, if the warranty will cover itId let it run out. The engine will operate on 8 cylinders in V8 mode during starting, idling, and medium or heavy throttle conditions. We figured we already had the intake manifold off to install the engine, why run the risk of MIL only to have to removed the intake manifold again without being paid. How stupid do you have to be to whine like a welfare check cashing idiot when there are literally 3 or 4 different ways to totally disable AFM. Pod. [], I have a 2012 Silverado Z71 bought new. My 2013 GMC Yukon XL 6.2L is currently having a failed lifer replaced. Question I have a 2015 Silverado and had a transmission go bad when I had it rebuilt I had the AFM/DOD turned off. Perform a Cylinder Deactivation (Active Fuel Management) System Compression Test. I tried the trans fluid in the oil. 2015 SILVERADO 1500 44 crew cab with 5.3L engine: So two weeks ago with approx 70K miles, I had an odd noise when accelerating and then engine light flashing and riding rough. [] they have a downside? When you drain the oil at three to four thousand miles its still clean. Fuel pump failure is the most common problem and can occur due to a number of reasons, such as a clogged filter or a faulty pump. Was thinking maybe I could trick the ruck into thinking the engine was not warmed up, however, this might cause some problems for other processes, such as mix ratio and timing. September 2017, I got talked into trading for 2017 AFM this was a bad choice 5.3 engine. Brian, We have purchased a used low mileage 6.2L as that is all the extended warranty company would pay for. . I bought a new 2017 Cadillac CTS back in January 3.6L V6 with 8-speed trans. A lot of drivers reported losing 2-4 quarts of oil in between oil changes. the body is in great shape. There is a chance the cam lobe was stressed and started to deteriorate. Its a simple and effective way to turn off the AFM system and provides the added bonus of improving exhaust sound. I read something the other day which I found to be funny. Love the truck so far. Anyway, after some pushing and pulling I took it to the Dealer who sold it to me. The engine is close siblings with the LMG which shared many of the same featuresexcept the LMF isnt saddled with AFM. Would installing the Disabler solve this? What type of ODBII gadget did you use? I am considering the same. Their tech guys have seen it all and may have some thoughts on this as well. After reading these forums Im a little concerned about my decision to stay with GM. Replaced all 16 lifters due to collapsed lifter on CYl #4. Disable the afm. There are two ways to disable or delete Active Fuel Management on your GM or Chevy Gen IV LS or LS-based Vortec engineone is to install an AFM Disabler, and the second is to install an AFM Delete Kit. As a side note, Range Technologies recommends removing the disabler between visits to the dealer as they will need to access the OBD-2 port. What type of disabler did you go with? The engine was not Flex Fuel (E85) capable and did not use Variable Valve Timing (VVT) [], [] TheL76like its LS2 siblingis a 6.0L, Gen. 4, aluminum small block engine that was used both in GM cars and trucks. Just had my afm lifter fail had to drive 500 more miles home on 7 cylinders in my 6.0 lt chev. I ordered a electronic disabler for it today. Told her that it would not last and that she needed to find a different way to get around. So I researched and got an AFM disabler. I just got new warranty engine and dont want this issue again? Should I wait until the warranty runs out, or will that be too late to stop possible damage? Im servicing a 2011 Chevrolet 5.3 with AFM. I bought a 2010 GMC Sierra 5.3L Truck in 2013 with 24K miles. [], [] LS Tech: How to Delete VVT or DisableAFM []. Its ribbed with solenoids on the underside. I got a 09 Chevy Ive had the 1 go out then the 7 about 2 weeks apart if I known what I know now I wouldve changed them all at once but now I have a misfire on cyl 4 but it came back in why are these lifters going out one at a time like this the 1st two that went out I was coming off the interstate an stabiltrack came on now the 4 misfired twice both times pullling out my driveway. They layed over night in engine oil before instalation. GM claims fuel improvements ranging from 5%-15% depending on the engine. Took it to a shop and they advised that it could be due to the AFM system not functioning properly. Welcome to socialism folks . Got rid of the bobblehead Rancho offroad shocks immediately and replaced with Bilstein coil overs. It came back on last Wednesday starting with a flash. As long as a lifter hasnt started to fail, you can get by with a less-expensive disabler as preventative maintenance. Theyre also notorious for bad cam tower oil leaks. The motor I pulled was a 2007 LY5 with about 77k on it. NOTE:If you were in a situation where youve installed the AFM delete kit, but dont have access to a programmera disabler can still be a viable option. In 2015, I purchased a new Tahoe with the AFM and two weeks ago with 71K miles on it, the engine light came on. [], I have 2007 5.3 its a new motor this truck scares me 9000.00 these trucks are jokes The lifter seems to recharge whenever the truck sits for some time. All the time. If doing that, the full blown AFM delete is about $1000 depending on how far you go (full overhaul or cam with lifters only). In the mean-time I found that you can keep the engine from going into 4 cyl mode by using the manual shift (if so equipped) and keeping it out of 6th gear. It uses a M14 x 1.5 thread plug like Dorman 65217. Only issue might be the oil consumption due to pressure run off and spraying of oil in crankcase? IMHO . Interesting that gm still hasnt gotten the bugs out of their Volt and now their 2nd attempt. Do not pay that amount. It could be the filter screen under the oil sending unit. Heres what you need to know: An AFM Delete Kit is recommended when an AFM lifter fails or when doing performance upgrades. It is usually first noticed during highway driving. The cylinders are deactivated by means of a double-stroke lifter which is FAR more prone to failure than a standard lifter. A problem with cylinder deactivation can be solved by tuning the intake and exhaust valves. But it also restricts passages that the oil runs through. I had a 2007 Yukon XL 5.3 with the AFM. The AFM activation and deactivation is controlled by the Valve Lifter Oil Manifold or VLOM. Install an AFM Delete Kit One the other hand, it came without AFM, VVT, or flex fuel capability. What if I was able to trick the computer into thinking it is in 5th gear when it is actually in 6th? Looking to tear down myself. The oil is baked on to every component. If you are using VVT, you could use the NAL-12612273 (L92) cam. They may be able to find some of those missing ponies. Now you tell me AFM works and I will tell you; that you are full of shit! Now im thinking of buying a disabler asap, am i in the clear to do so without the oil splashing problem? NOTE: A disabler device should ONLY be used if the valvetrain is in good working order. I bought a 2022 GMC Sierra 1500 with 5.3L, X31 off road package a year ago. Carbon Build-Up in the Intake Ports. My concern is if I leave the non-AFM lifter cover in place & have nothing to plug the 5 pin AFM solenoid connector into, will I get a MIL? We chickened out though and just bolted the AFM solenoid plate onto the used engine. You can monitor the oil level on your dipstick for 3,000 miles to determine if the deflector or plug would be needed, but chances are you wont based on the TSB. How long did it take? I dont know where to being to look for the problem. the extra oil isnt needed. Do you think it would be wise to put a AFM disabler on a brand new truck to avoid engine damage? Took it to the dealer and was told I had a collapsed lifter. I had purchased an extended warranty when I bought the truck new. Just pulled it down in the garage there was no other damage , luckily. Toyota has their own problems. They are taller and have special oil holes. I have a Yukon 116k it now needs its 3rd set of lifters and cam. A lot more info with the ongoing GM 5.3l AFM engine issues on Cargurus. It does seem that when they start goingthey go quickly. Didnt change exhaust nor tune so likely no change in power/torque. I only have ~ 5k miles on it, and it hasnt been driven hard, so Im assuming the lifters are fine. I ran 0W-20 on more the 5000 miles between changes. I used 1 quart of tranny fluid in the crankcase ran it for 20 minutes, no luck. Driving around with a bad AFM lifter is the fastest and easiest way to destroy an engine. Yeh truck has 5237 miles on it Any problems to watch out for?Did you replace the VLOM? I couldnt agree with you less, yet I respect your opinions. Whats the next step? We believe this confirmed that the AFM has never been operating in this vehicle. they are known to become plugged. Question is, since my 2004 ECM and wiring harness were made before the AMF came about will this motor work properly as a V8 or will I need to replace the lifters, cam, oil sensor, etc as the delete method mentions? Since the tranny oil worked, you should now change the oil, right? I have an 07 Yukon with 230k on the engine. another common cause for low OP is the oil pick up tube O ring. I would rather stay a V8 full time than deal with AFM issues in the future. thank You so much! The owner of the vehicle has apparently owned a few of these vehicles and stated that this vehicle doesnt have AFMnever did? Wow, thanks for the wisdom,, i checked my VIN Code (position #8, M=LH6) and my 2005 Saab 9-7x does have the LH6 motor with iron block, Are you sure its only 2007 & newer motors? And consider using a higher grade of engine oil like Mobil 1 or Amsoil, etc. Cylinder Deactivation to the Rescue. All ready done valve job . On the AFM lifters that dosnt work i have installed them With the oil hole Down! Next day, fired it up to take the the junk yard and it ran great. Given that, would you recommend buying one of the OBD-II devices to disable AFM? At least Dodge admitted they had junk transmissions in the early 2000s and picked up sales each. I have no clue what to do now. It seems to me that the high volume oil pump should not hopefully cause premature wear but if it is pushing more oil through the heads than I guess the valve stem seals have more work to do. He claims that GM used the same engine whether it was or was not equipped with AFM in this year and model? [], [] as the LS engine familys hybrid engine in trucks and SUVs. This will spray oil on the bottom of the cylinder walls which can cause oil burning, especially in high-rpm engines. One alternative is to swap in one of the larger 6.0 non-AFM truck cams. Hi Grant is that disabler still working for you ? It will show up as a misfire code in a cylinders 1,4,6, or 7. Ever since that which was Feb/March 2020 i get a intermittent rattle does not do it all the time and I am not getting any codes i.e. Thanks for the advice Brian! Please report back if you have any issues, but I think you are in good shape. You mentioned that it will shoot oil into the pan and on the cylinder walls possibly causing some oil consumption So i have a running vehicle and my only concern is making it as reliable as possible, should I disable the AFM or not?? Yesterday my motor (116,000 miles) felt like it went into limp mode when decelerating from 8 cyl to 4 cyl but it recovered.This is the second time that this has happened in 6 months so I think that I am on the slope. Hello Mike, if you dont have any obvious signs like check engine lights etc., there are couple different possibilities. Where can I buy a bolt to replace this relief valve ?? However I do have 7 year bumper to bumper warranty that covers this problem if I start to get lifter problems over the next 2 years.. On the other hand if get the AFM disabler installed I am pretty sure that I void the warranty from what I read on the policy. It is replaceable.. just remove oil pan and it will be on top at the filter. My point is that the engine likely on uses dod a small percentage of the time so can not really imagine that the delete causes any more issue than normal which may be the high oil consumption but do all of these engines with dod consume a lot of oil? Required fields are marked *. Would really appreciate your comments on this point as really interested in an 07/08 escalade without or an 09 hybrid with dod. I have always loved Ford and Chevys , I dont like this Vehicle not one bit, starring shaft has to be lubed or it whines, front A arms has done been replaced, tapping in motor, leaf springs has been lubed, retorqued, put completely new leaf springs back in on the rear , grease all down from rims to body of truck, you have to clean often,console shakes as if milk shakes in console which later they also put rubber bushings in front of coils of shocks ( front end) .You lock it down in 44 it s metal to metal , As of now Im at 32,000 done gone threw all the arbitrator laws depending on how it goes? I have successfully used a gadget that plugs into the ODBII. Perhaps a flaw by design would be a more appropriate description . Troubles begin with Bean-counters decide on what can be used for production and engineers who arent Gear-Heads. If possible, will simply not using VVT provide a powerful,good running engine? I can literally drive from Seattle to Redding CA on one tank. No movement on the rocker arms. i just bought a 2018 Silverado with the 5.3 I may just do that Vic. There are 5.3 cylinder deactivation problems that can occur. After taking a $3.6h bath on the lifter/valve work and doing a little research, how can GM allow a problem like this AFM continue from 07 to present? With the nipple, or without? The engine will switch to operating on fewer cylinders when cruising at a constant speed. I would appreciate it if you let me know how you make out. The LH6 in 2005-06 was a little different than the one used in 2007-09, but both had AFM. My 2002 I had over 298K on it with no engine related issues. (Bought car 1 day before lifter died!) It has 8,000 miles on it. Just like Ram and their trash MDS system or Ford and their throwaway Ecobust engines. []. I am trying to find out of this is true. You can reuse the original valley cover OR use a non-AFM valley cover, leave the harness connected, and tuck the solenoid pack away. That might show up if you cut the filter and looked for debris in the pleats. Ive got about 6 to 8 psi of oil pressure after the engine gets warm and I have to stop at a traffic light. 1981 Cadillac V 864. (Non-AFM engines have a smooth cover.). thx Brian, Knock on wood I drive a 2011 silverado 44 Ltd with the 5.3 AFM/DOD not tuned out or delete being used and have experienced no problems or any sign of problems for that matter juat rolled over 210,000 all original factory parts would you suggest I tune it out or juat let it ride I change my oil religiously and also use lucas products for all aspects of my motor. Found that all passenger side cylinders are not firing. They lasted one year with big problems. I ran 0W-20 no more the 5000 miles between changes. The tune is the best bang for the buck outside a cam swap anyway and what Id recommend. As a side note, the early ones had a 24x reluctor and plastic chain guide (good) vs. the later ones with 58x and the spring loaded tensioner (not so good). What if the pressure relief valve is stuck OPEN and the oil pressure never gets up to where it needs to be? Engines with AFM use a high-volume oil pump. If Problems regarding Chevy 5.3L engines, if the running compression of the misfiring cylinders stays below 25 PSI. I drive the same 320 mile trip every two weeks and drive the same route and full tank. Replace the cam or do the delete kit? Dont follow just anybody I know where it originates but in todays world I found found it to be amusingly accurate. I have ordered an ATM disabler and will be putting a can of Textron in the gas at the next fill up. Most of all, my concern is reliability. I call it active obama fuel management .A scam . Next day I drove my car to work and was fine but when I left work all lights came back on and terrible noise in the hood. A problem with the software caused the engine to idle with most of their cylinders, thus overheating the exhaust . For a primer [], [] cathedral port cylinder heads and used Active Fuel Management (AFM). Get this, rebuild is only rings and maybe lifters. The system uses solenoids to deliver oil pressure to control. It was well researched and tested back in the late seventies and eighties . You cannot compare them to old 350s. Pulled the inntake and replaced valleypan With all the solenoids. I called my service station and they told me to get it in ASAP. I did noticed the oil consumption but it was rare that I would have to add oil. Thanks for the detailed post! What the biggest reported problem with Chevy Silverados? A bad lifter can be a minor repair if you get it fixed immediately after you hear an issue. Does the Pressure relief vavle ever go bad?? Yes a poor design but a flaw ? a little burning oil is a minor thing, my main concern is avoiding a multi-thousand dollar repair needed to the motor. Both #6 lifters only move when turning engine by hand, if you use the starter they stop moving. How do you know if the lifter has failed? Is this due to the AFM being shut off? All Cylinders. When you eliminate the AFM system, the extra oil is no longer needed. This update also saw the usage of cylinder deactivation technology or Active Fuel Management. [] For more information on AFM, including a comprehensive guide on how to completely remove it from your engine, check out this article. How did your turn out? [] For more on that, read:How to Delete or Disable Active Fuel Management (AFM) on GM Engines. Plugs spark fine engine has power at higher RPMs although it is still in Limp mode / stabilitrack message, even after driving it a few times above 60 MPH then clearing errors with handheld programmer. You may want to update your post. Having a hard time finding one .. Im always sorry to hear when people run into issues like these. lol. Was a disaster then but a profitable disaster. We recently purchased an 08 Suburban and noticed some shuddering around crusing speeds, usually 45-55mph and highway speeds around 75mph. Once the failure has occurred, the AFM shut off methods other than that probably wont work. A 17 with 5.3. Regardless of the AFM solenoid being commanded on or off. So bad theyve been rated least reliable midsized truck by consumer reports for 3 years in a row. This replacement engine has the same camshaft sensor plug plug, 5 wire like the AFM would use, instead of the 3 wire. have yet to find a read that shows an escalade with high oil consumption and i have read a lot on the hybrid. Brian, I have a 2010 burb with the exact same symptoms and questions as Shawn please help! Afaik the 6.0 escalade hybrid does have it so wondering if safe to delete. I have 1999 Silverado with out AFM that gets 21 mpg and a 2008 with it that gets 14.6. i currently get 8 mpg with the vortec 350 and a 4l60, I have a 99 Sub k1500 that i get 16 to 18 hwy loaded lightly, I get about 14 on my 95 Tahoe 2 door with 5.7 and 4l60. We are looking into the AFM Disabler option, but my question is- how do we know if a lifter is already bad or not? I hate it. Since it is not costing me anything out of pocket, I did not go with the Delete Kit (did not want to spend the money). . Most of the complaints show up in the 2009 to 2011 model years. It has AMF. Thats not all bad because it saves the cost of an AFM delete kit. Active Fuel Management (AFM) is a trademarked General Motors technology that improves gas mileage by shutting down half of the cylinders under light-load conditions to reduce fuel consumption. You could also have tried that if the trans oil didnt work. I already ordered the parts to replace myself and remove the code. [] For more on that, read: How to Delete or Disable Active Fuel Management (AFM) on GM Engines. The cost of just rings $4,000.00, [] Disable your Chevy AFM: https://www.onallcylinders.com/2017/11/30/how-to-delete-or-disable-active-fuel-management-afm-on-gm-… [], [] like front timing cover, knock sensor location, cylinder head style (cathedral ports), AFM (Active Fuel Management), and other components are key clues to which engine family youre looking []. It was the first Gen. IV LS truck engine and offered Active Fuel Management (AFM). Once the lifter has been damaged, the cam is probably also damaged. The LFA was upgraded with AFM and [], [] improvement over AFM, DFM has 17 different cylinder firing patterns and switches seamlessly between them to provide just []. Is the Pressure relief valve replaceable? This may show as low oil pressure or code P0521 or P0523 and is a relatively inexpensive fix as well. If I had wanted a 4 banger I would have bought one. Its not possible to install them wrong? .That was a year ago and now I have a collapsed lifter and the most inexpensive repair $2200.00 for a partial lifter replacement. It only has about 9k miles on it. Cylinder deactivation--branded Active Fuel Management by GM--shuts off some cylinders when extra power isn't needed, to improve fuel economy. It prevents the computer from switching over to four-cylinder mode. HP tuners is not for someone like me that doesnt know how to use it and from what I read neither the range nor diablo plug and play device will work since the buicks pcm files are different than all other GM vehicles that came with afm because it was tuned in house at gms performance division. I just bought a 2015 5 3 17000 miles I was thinking about eliminating the 4-cylinder if I delete it with just the programmer will it hurt my motor? Our patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU.
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